<template>
  <div>
      <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图 -->
    <el-card>
        <!-- 提示区域 -->
       <el-alert
          title="添加商品信息"
          type="info"
          center
          show-icon
          :closable='false'>
        </el-alert>
        <!-- 步骤条 -->
        <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
           <el-step title="基本信息"></el-step>
           <el-step title="商品参数"></el-step>
           <el-step title="商品属性"></el-step>
           <el-step title="商品图片"></el-step>
           <el-step title="商品内容"></el-step>
           <el-step title="完成"></el-step>
        </el-steps>
        <!-- tab栏区域 -->
        <el-form ref="addFormRef" :model="addForm" label-width="100px" :rules='addFormRules' label-position='top'>
        <el-tabs v-model="activeIndex" :tab-position="'left'" :before-leave='beforeTabLeave' @tab-click="tabClicked">
           <el-tab-pane label="基本信息" name='0'>
               <el-form-item label='商品名称' prop='goods_name'>
                  <el-input v-model="addForm.goods_name"></el-input>
               </el-form-item>
               <el-form-item label='商品价格' prop='goods_price' type='number'>
                  <el-input v-model="addForm.goods_price"></el-input>
               </el-form-item>
               <el-form-item label='商品重量' prop='goods_weight'>
                  <el-input v-model="addForm.goods_weight"></el-input>
               </el-form-item>
               <el-form-item label='商品数量' prop='goods_number' type='number'>
                  <el-input v-model="addForm.goods_number"></el-input>
               </el-form-item>
               <el-form-item label='商品分类' prop='goods_cat'>
                  <el-cascader
                     v-model="addForm.goods_cat"
                    :options="catelist"
                    :props='cateProps'
                    @change="handleChange">
                  </el-cascader>
               </el-form-item>
           </el-tab-pane>
           <el-tab-pane label="商品参数" name='1'>
              <!-- 渲染表单的item -->
              <el-form-item :label='item.attr_name' v-for="item in manyTableDate" :key='item.attr_id'>
                  <el-checkbox-group v-model="item.attr_vals">
                     <el-checkbox bprder :label="cb" v-for="(cb, i) in item.attr_vals" :key="i"></el-checkbox>
                  </el-checkbox-group>
              </el-form-item>
           </el-tab-pane>
           <el-tab-pane label="商品属性" name='2'>
              <el-form-item :label='item.attr_name' v-for="item in onlyTableDate" :key="item.attr_id">
                  <el-input v-model="item.attr_vals"></el-input>
              </el-form-item>
           </el-tab-pane>
           <el-tab-pane label="商品的图片" name='3'>
             <el-upload
               :action="uploadURL"
               :on-preview="handlePreview"
               :on-remove="handleRemove"
                list-type="picture"
               :headers='headerObj'
               :on-success='handleSuccess'>
                <el-button size="small" type="primary">点击上传</el-button>
             </el-upload>
           </el-tab-pane>
           <el-tab-pane label="商品的内容" name='4'>
             <!-- 富文本编辑器组件 -->
             <quill-editor v-model="addForm.goods_introduce"></quill-editor>
             <el-button type='primary' class="btnAdd" @click="add">添加商品</el-button>
           </el-tab-pane>
        </el-tabs>
        </el-form>
    </el-card>
    <!-- 图片预览 -->
    <el-dialog
       title="图片预览"
      :visible.sync="previewVisible"
       width="50%">
      <img :src="previewPath" alt="" class="previewImg">
    </el-dialog>
  </div>
</template>

<script>
import _ from 'lodash'
export default {
  data () {
    return {
      activeIndex: '0',
      // 添加商品的表单数据对象
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        // 商品所属的分类数组
        goods_cat: [],
        // 图片的数组
        pics: [],
        // 商品的详情描述
        goods_introduce: '',
        attrs: []
      },
      addFormRules: {
        goods_name: [
          { required: true, message: '请输入商品名称', trigger: 'blur' }
        ],
        goods_price: [
          { required: true, message: '请输入商品价格', trigger: 'blur' }
        ],
        goods_weight: [
          { required: true, message: '请输入商品重量', trigger: 'blur' }
        ],
        goods_number: [
          { required: true, message: '请输入商品数量', trigger: 'blur' }
        ],
        goods_cat: [
          { required: true, message: '请选择商品分类', trigger: 'blur' }
        ]
      },
      // 商品分类列表
      catelist: [],
      cateProps: {
        label: 'cat_name',
        value: 'cat_id',
        children: 'children'
      },
      // 动态参数列表数据
      manyTableDate: [],
      // 静态属性列表数据
      onlyTableDate: [],
      // 上传图片的url地址
      uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
      // 图片上传组件的header请求头对象
      headerObj: {
        Authorization: window.sessionStorage.getItem('token')
      },
      previewPath: '',
      previewVisible: false
    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    async getCateList () {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类数据失败')
      }
      this.catelist = res.data
      console.log(this.catelist)
    },
    handleChange () {
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
      }
    },
    beforeTabLeave (activeName, oldActiveName) {
      if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请先选择商品分类')
        return false
      }
    },
    async tabClicked () {
      if (this.activeIndex === '1') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: 'many' } })
        if (res.meta.status !== 200) {
          return this.$message.error('获取商品分类数据失败')
        }
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split('')
        })
        this.manyTableDate = res.data
      } else if (this.activeIndex === '2') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: 'only' } })
        if (res.meta.status !== 200) {
          return this.$message.error('获取静态属性失败')
        }
        this.onlyTableDate = res.data
      }
    },
    // 处理图片预览效果
    handlePreview (file) {
      this.previewPath = file.response.data.url
      this.previewVisible = true
    },
    // 处理移除图片的操作
    handleRemove (file) {
      // 1.获取将要删除的图片的临时路径
      const filePath = file.response.data.tmp_path
      // 2.从pics数组中，找到这个图片对应的索引值
      const i = this.addForm.pics.findIndex(x => x.pic === filePath)
      // 3.调用数组的splice方法，把图片信息对象，从pics数组中移除
      this.addForm.pics.splice(i, 1)
      console.log(this.addForm)
    },
    // 监听图片上传成功的事件
    handleSuccess (response) {
      // 1.拼接得到一个图片信息对象
      const picInfo = { pic: response.data.tmp_path }
      // 2.将图片信息对象，push到pics数组中
      this.addForm.pics.push(picInfo)
      console.log(this.addForm)
    },
    // 添加商品
    add () {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) {
          return this.$message.error('请填写必要的表单项')
        }
        // 执行添加的业务逻辑
        // lodash cloneDeep(obj)
        const form = _.cloneDeep(this.addForm)
        form.goods_cat = form.goods_cat.join(',')
        // 处理动态参数
        this.manyTableDate.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join('')
          }
          this.addForm.attrs.push(newInfo)
        })
        // 处理静态属性
        this.onlyTableDate.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals
          }
          this.addForm.attrs.push(newInfo)
        })
        form.attrs = this.addForm.attrs
        console.log(form)
        // 发起请求添加商品
        const { data: res } = await this.$http.post('goods', form)
        if (res.meta.status !== 201){
          return this.$message.error('添加商品失败')
        }
        this.$message.success('添加商品成功')
        this.$router.push('/goods')
      })
    }

  },
  computed: {
    cateId () {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    }
  }
}
</script>

<style scoped>
.el-checkbox {
  margin: 0 10px 0 0 !important;
}

.previewImg {
  width: 100%;
}

.btnAdd {
  margin-top: 15px;
}
</style>
